Diego Milito and Goran Pandev scored the goals for Inter.
Beckham is confident his side still have a chance of winning the Scudetto this season.
“We are very disappointed about the result,” Beckham told the club’s official website. “But this is part of football.
“It didn’t matter that we had the numerical advantage, we were just unlucky, and this can happen.
“Nothing is lost, as there are still a lot of matches to go until the end of the season. We can still catch up and win the Scudetto,” Beckham concluded.